Abstract: This chapter examines the empirical complexities of territorially based ethnic separation (boundaries) against the growing philosophical justifications for self-determination. Horowitz argues that ‘clean breaks’ are not likely, not least because ethnicity itself is a contextual and therefore mutable affiliation, and argues that more attention should be paid to encourage domestic measures of interethnic accommodation.

Keywords: accommodation, affiliation, borders, boundaries, ethnicity, national pluralism, secession, self-determination,